I don't have a tubular wheelset, and I never really plan to, so it does leave me open to play around with different tires more easily and swap them out for races more often. The downfall is I can't run as low of pressure without running the risk of pinch flats. But I'll take those pros against the cons.
I know I haven't spent a great deal of time on these tires, but I do have a great deal to say about them both. It's amazing how much you can learn about tires in just a few rides. Only a couple hundred miles on the bike at most and I feel I have it all dialed in. At least pretty close.
First off, the Bontrager CX3 tires...
Right away, the tread pattern is pretty blocky. There isn't much rhyme or reason to them, but they seem like they could shed mud pretty well. Which they do. Riding them on the road, they don't bobble too much, which makes them a pretty comfortable ride to jump on and off trails if you're looking to do that kind of thing. I have ridden them through snow as well, and they grap down to the pavement pretty well, so long as there is no ice hiding beneath. Let's face it, there really isn't any tire out there that can handle ice very well that isn't a studded tire.
Race wise, I wasn't very impressed with these. I felt sluggish in the flats and open spots, but was also feeling loose in the corners. Running somewhat low pressure, I figured I would be able to run the corners on rails and maybe suffer a bit in the flats. However, I felt at a loss all around. The only place I felt like I was gaining anything by riding these tires was climbing. They really felt to grab on as I made my way up some steep climbs. I am not sure if that meant I was running too high of a pressure to really grab the corners or if the nobs just don't want to grab as I lean in.
Overall, they are a good quality, middle of the road tire that can handle most conditions. In my opinion, a great tire for use in commuting all year round and bouncing on and off roads if you're looking to run just one set of tires.
Next up, the Challenge Grifos:
Right off the shelf, these tires just look meaner and leaner than the CX3s. They do come with a little heftier price tag, but if you're looking for a more well-rounded race tire, these are it. The first thing you notice is their gum-colored sidewalls. They do standout and make the bike look a little more pro. But that's neither here nor there. I noticed the more patterned tread pattern that made me feel like these tires could grip and pull better than the CX3s right out of the box. And they sure did. Immediately I noticed how I could pull myself along and felt the nobs gripping both the pavement and gravel, as well as grass and leaves upon first ride.
They are a bit tougher to seed and mount than other tires, as they are handmade and come perfectly flat. Once you learn how to feel out the way to mount them, they are pretty easy.
As far as race goes. If you want one tire to run in all conditions, these are awesome. They grip well in the corners, and I was running upper 30s psi and rip up the open. They handle the pavement well with enough tread to grip the wet as well.
In the end, if you want an all around tire that handles everything at a lower price, go with the CX3s and never look back. If you want a bombproof set of tires that you can leave on for racing in all conditions with a little more of a price tag, grab a set of the Grifos.
-Dave
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